[Cin] ffmpeg - cuda

Phyllis Smith phylsmith2017 at gmail.com
Sat Apr 11 18:38:17 CEST 2020

Thank you so much for sharing your results which are quite impressive.  Am
I understanding correctly that the only change you ended up making was
to (0x00000002) ?? *allow_high_depth" to the h264-nvenc.mp4 ffmpeg option
file?  I want to add that as a choice for others to see.  Probably your
newer/higher end graphics board was very beneficial -- a good way to
justify upgrading if using h264/h265.


On Sat, Apr 11, 2020 at 7:07 AM <sergiogomez at tostado.com.ar> wrote:

> Thanks a lot! Well...
> pipe option isn't better in this case (I did some test). Changing  parameters
> to pass in  the "view" button, ffmpeg option, not codec, is better.
> Attached images show some information to think it's using HW
> Acceleration. It's using 2 of 6 cores when before used all cores to
> reender. And use dedicate memory of graphic card and more GPU  and video
> engine. Render time reduce about 25% and that's excelent
> Oh! The more important topic ! Manual is amazing. I'm trying to translate
> to spanish (slowly) to read the whole book and colaborate with CinGG
> Sergio
> El 2020-04-10 15:13, Phyllis Smith escribió:
> Sorry, I (Phyllis) did not quite understand the question and it was late
> at night so my brain was tired.
>> My original question was: Can I pass some imput parameters to ffmpeg in
>> render process? And I ask this again. Why? Becase ffmpeg -hwaccel cuvid
>> can enconder x264 at 13,7x and without this parameter, just 2.5x. And at
>> the moment, x264 is sufficient for me.
> One way to get parameters passed to ffmpeg while rendering is using the
> "Piping Video to a Command Line" (this was adapted from CV) and is
> documented in Rendering chapter 6 of the manual (6.5.6 section).  I have
> not re-tested that in awhile but there is no reason that it should not be
> working.
> The second way which might only work for certain parameters, is to click
> on the Video wrench in the Render Menu and try to see if the parameter you
> want to pass is available in either the "view" button which brings up
> another menu and on the top right hand side is the button "Kind" which
> defaults to "codec" but can be set to "ffmpeg".   And/Or click on the
> "format" button which provides additional parameters -- these only sort of
> work and probably not what you want.
> A third way is just to write a Shell Command and use that via the "shell
> cmds" button in the upper right hand corner of the timeline by the "Ffmpeg
> use first/last button".
> None of these are easy and you are a brave man to attempt them !!  Phyllis
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
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